Video Watermarker
Overlay an image watermark in the bottom-right corner of a video in your browser.
Runs in your browser Your input never leaves your device.
About this tool
Choose a video and a watermark image, such as a PNG logo, and the tool places the image in the bottom-right corner, 10 pixels from the edges, using ffmpeg in WebAssembly. The video is re-encoded to MP4 while the audio is copied unchanged. It runs in your browser and nothing is uploaded. The image is overlaid at its original size, with no scaling, opacity or position controls, and there is no text option. Resize your logo to a suitable size before uploading. A PNG with transparency keeps its see-through areas. The first run downloads the ffmpeg engine (about 25 MB) from a CDN, which can take from a few seconds to a minute on a slow connection; later runs on the same page reuse it.
How to use it
- Choose the video as File 1.
- Choose the watermark image, ideally a small PNG, as the second file.
- Press Process and wait; re-encoding is slow.
- Preview and press Download (output.mp4).
Common problems
- The watermark covers most of the video
- It is not resized. Shrink the image to a small logo in an image editor first.
- I need a different position or text
- Only the bottom-right corner and image watermarks are supported.
- It is slow, or the tab freezes or runs out of memory
- ffmpeg runs in a single browser thread on your device. Use a shorter or smaller file and close other heavy tabs.